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UCM RemoteConnect – Endpoint Configuration Guide

  • Updated on November 3, 2023

The UCM6300/A series IP PBX provides UCM RemoteConnect service which offers users a quick setup to start working remotely including GS Wave web app using WebRTC and Wave mobile app on Android and iOS system to communicate and join meetings, sync up and manage extension, receive alerts and reports, view and manage storage via cloud, and much more. The UCM6300/A UCM RemoteConnect service is offered via Grandstream Device Management System (GDMS). Please visit GDMS platform for UCM RemoteConnect service plan information and purchasing plan, device remote management, cloud storage management and etc.

This document describes how to configure end users’ IP phones to register to UCM6300/A series IP PBX UCM using RemoteConnect service. With RemoteConnect service, IP phones behind NAT can register to UCM6300/A series and communicate with other devices without additional settings in your network.


The UCM RemoteConnect service on UCM6300/A series must be used with Grandstream Device Management System (GDMS). After the UCM is connected with GDMS, the RemoteConnect information displays as below on UCM6300/A web GUI🡪UCM RemoteConnect page. In this page, STUN Address, UCM Public Address and Public TLS Port information are needed for IP phone to register to UCM6300/A series.


The UCM63XX/A IP PBX supports up to 3000 extensions.

Figure 1: UCM RemoteConnect Plan Information

The clients can configure the IP phone to register to UCM6300/A series and manage the IP phone remotely via GDMS, or directly configure the account information on IP phone manually.

Configure SIP Extensions on GDMS

The GDMS admin can configure SIP extensions remotely with the settings required for RemoteConnect. To do so please follow the steps below:

Step 1: In your web browser, open the GDMS address and log in with your GDMS account: http://www.gdms.cloud/login

Step 2: After adding UCM into your GDMS, got UMCRC System and UCM Device to quickly navigate all the SIP servers. For a specific SIP server address, users can click on icon to quickly check the SIP server settings.

Figure 2: UCM Device Page


If user’s service’s package supports such feature, the user can click on to modify the remote server address as needed. 

Step 3: To assign/modify the IP Phones, firstly go to the Extension page on GDMS. Users can check all the extension information and modify the SIP server for the extensions as long as the server is under the same organization. See Figure 3 for an example.

Figure 3: Extension Page
  • Select the desired extension(s).
  • Click on then select the server.
  • Click on “Save” to apply changes. After changing the SIP server, the new settings will be pushed to the associate extensions.
Figure 4: Modify SIP Server

Configuring SIP Accounts on End Devices

IP phone end devices behind NAT in external networks can register to the UCM6300/A series for remote work purposes.

Method 1: Configure SIP Account from End Device Web User Interface

In this method, the user needs to configure the SIP server on the end device web UI using the UCMRC SIP Phone/Trunk Traversal Address and configure NAT to STUN with a specific STUN server. For SIP transport protocol, it must be set to TLS using TLS version 1.2.

Please refer to the below configuration example on GXV3370.

Step 1: Log in GXV3370 web UI as admin, navigate to Account🡪Basic Settings page and configure the following:

  • SIP Server: Enter the UCM Public Address: Public TLS Port. This information can be found under UCM Web GUI🡪RemoteConnect🡪Plan page.
  • NAT Traversal: STUN
Figure 5: GXV3370 Account Configuration Page

Step2: Go to Account🡪SIP Settings and configure SIP transport to “TLS”.

Graphical user interface, application, Teams

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Figure 6: GXV3370 Account🡪SIP Settings

Step 3: Go to phone’s Web UI🡪Phone Settings🡪General Settings, configure the STUN server to be same as the one under UCM Web UI🡪 RemoteConnect🡪Plan page.

Figure 7: GXV3370 Phone Settings🡪General Settings

Step 4: Go to the phone’s web UI🡪System Settings🡪Security Setting🡪TLS page, configure “Minimum TLS Version” and “Maximum TLS Version” to be 1.2

Graphical user interface, application

Description automatically generated
Figure 7: GXV3370 TLS Configuration

Method 2: Assign SIP Account for End Device from GDMS

In this method, user needs to log in GDMS to assign SIP account to the end device.

Step 1: Add the end device as VOIP Device to GDMS. Click on “Save” to save the configuration.

Figure 9: Add Device to GDMS

  • Each end device can only be added to ONE GDMS account at a time.
  • Users can use the “Device Name”, “MAC Address”, or “Site Name” to search for the end device.

Step 2: There are two methods to assign the SIP accounts for the end device on GDMS.

Assign Method (1): Configure SIP Accounts from VoIP Device Page

a. In the VoIP Device Page, click on to enter the Account Configuration page.

b. In this page, users can choose to deploy the extensions from the Extension page to the device.
They can also change the existing extension to another or remove existing extensions.

c. Save and apply the configuration.

Figure 10: SIP Account Configuration Page

  • If the device becomes offline during the account deployment, GDMS will push the settings once the device comes back online.
  • Configurations from other methods such as via phone’s web UI, Zero Config, etc… will not sync to GDMS.

Assign Method (2): Assign SIP Account from Extension Page

Step 1: Select “UCMRC System” on the upper left page in GDMS and go to the Extension page, select the extension that needs to be assigned to the phone, and click to assign an account.

Figure 11: Assign Server to Device on GDMS

Step 2: Click the “Add Server” button and select the server address that the user wants to add for the extension.

Step 3: Assign the server to the phone. Select the site, device, MAC address, account location and the UCMRC server address to assign.

Step 4: Click the “Save” option to complete assigning the extension to the phone.


  • When configuring the UCMRC server address to the phone, in order to make UCMRC work normally, the system will automatically issue the following configuration to the phone:
    1. SIP transport is configured as “TLS”.
    2. The STUN server is configured as the address of the UCMRC TURN service.
  • After assigning an account to the phone on the GDMS, if the phone cannot be registered or there is a problem with the call after registration, please go to the phone to check whether the configuration is correct according to section [CONFIGURING SIP ACCOUNTS on END DEVICES].
  • When deleting the phone’s UCMRC server account, the system will automatically clear the phone’s STUN server configuration.
  • Terminal devices not supported on GDMS cannot be remotely managed and deployed.
  • Clients will not be able to edit SIP UserID, Authentication ID, Authentication Password, Display Name or Voice Mail Access Number from this page.
  • The available devices for configuration will be the devices listed in the VoIP Device page.

Make Calls using IP Phones

After configurating the IP phones with UCM RemoteConnect service, users can use the phone to make audio/video calls and join GS Wave audio/video conferences.


Presentation on end device IP Phones is currently not supported.

Below are the Grandstream devices that supports RemoteConnect services with UCM6300/A series:

  • GXV3350/GXV3370/GXV3380
  • GXP series
  • GRP series
  • WP820
  • DP750
  • GVC series.

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